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My Project: ATX Bench PSU


My Project: ATX Bench PSU

Postby stretch on Mon Feb 07, 2011 4:02 pm

Last weekend It came to the point when I needed to test my truckputer setup using the 12v power setup I’d done. Now initially it seemed the only way to do this was to take everything out to the car and test, however this was impractical as if something didn’t work or I needed to make any changes I would’ve had to take it back inside fix it then go back out again.

I then started looking at 12v bench power supplies but there coming up at around £35 which seemed a little excessive as it wouldn’t be used very often.

Then I remembered seeing an article about someone creating a bench power supply from an old atx psu. After some scouring different ways of doing it I decided to build one myself. You could use this for anything that requires 12v ie CB etc.

Although I only really need 12V I thought I’d add the 5V and 3.3V as well just in case I needed them in the future. I have no need for –5V and –12V but you can add them if you wish.

WARNING: You are dealing with mains electricity here, if you don't know what your doing do not attempt to carry this out, I accept no responsibility for damage/injury/death.

Wiring

Purple: +5V Standby
Green: DC On
White: -5V (not available on all psus)
Orange: +3.3V
Yellow: +12V
Red: +5V
Black: GND
Blue: -12V
Grey - Power is on

PSU’s sometimes require a small load in order for them to power up so some people add a 10 ohm >10 watt resistor between a red and black wire however I used an illuminated 12v switch which has the same effect.

LED switch green + black / Grey + black

First I grabbed an old 350W ATX PSU I had lying around as you can see it's capable of quite high loads.

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Next whipped the lid off (this obviously invalidates your warranty) and had a look inside

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next was to bunch up all the external wires and chop the connectors off

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Then bunch them together by colour and zip tied

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next mark and drill holes for the bananna plug posts

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Fit posts and make hole for switch (nightmare)

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Add ring connectors to wires by colour and put onto posts and wire up switch

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All looks good

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Replace lid and test

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Label posts, Job done lovely jubbly
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stretch
Rain cloud of doom
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Posts: 3163
Joined: Wed Jul 18, 2007 3:26 pm
Location: Ipswich
Model: 2.2 DTI 5dr
Registration Year: 2000/W
Vehicle Name: F.I.T.T
Modifications: 12v feed in boot
Truckputer under construction
Front & rear recovery points
De side stepped
Region: East Anglia



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